Fuse plug



J an. 23, 1923.

WITNESSES W. F. HEINS ET AL.

FUSE PLUG.

ORIGINAL FILED JULYII. 1919.

INVENT'ORS 7Z Iii/115 ia/0112i? A TTORNE Y8 Patented Jan. 23, 192 3.

UNITED STATES 1,443,261 PATENT OFFICE.

wiLLiAM r. HEINS AND JOHN news, or ALBANY, NEW YORK.

'rusn PLUG.

Application filed July 11, 1919, Serial No. 310,053. Renewed November23, 1822.

To all whom it may concern:

Be it known that we, WILLIAM F. HEINS and JOHN Hams, both citizens ofthe United States, and residents of Alban in the county of Albany andState of ew York, have invented a new and Improved Fuse Plug, ofwhich'the following is a full, clear, and exact description.

This invention relates to fuse plugs and- A still further object of theinvention is to provide a fuse plug with a removable hollow porcelainwhich presents a blow-out chamber.

Another object is to formthe plugin such a manner as to cause the burntgases to slowly ooze out therefrom whenever the a fuse blows.

In the accompanying drawing:

Figure 1 is a side view of a fuse plug disclosing an embodiment of theinvention, certain parts being broken away for better dis closing theinvention.

Figure 2 is a section through Figure 1 on line 2-2. 1

Figure 3 is a top plan view of the plug' shown in Figure 1.

'Figure 4 is a detail perspective View on an enlarged scale of the fuseand contact coacting therewith, the same embodying certain features ofthe invention.

Figure 5 is a sectional view through Figure 2 on line 5-5. I

Referring to the accompanying drawing bygnumerals, 1 indicates a bodyprefer-ably formed of porcelain. This body is constructed with a chamberor recess 2 open at one end and with threads 3 for receiving thethreaded sleeve or shell 4. Shell 4 is secured'to the depending flange 5of the fibre cap 6 by any desired means, as for instance by spursextending from the sleeve into the flange 5. As seen in Figure 2 the cap6 is provided with a central opening 7 normallyclosed by a sheet of mica8 resting against the shoulder 9 of cap 6. When the body 1 is screwedinto place in the shell 4 the end thereof firmly clasps or presses themica 8 against shoulder 9. This forms a substantially gas tight jointat-this point,

but the gas may slowly escape through a number of comparatively smallopenings 10 in the body 1, to the groove 11 and from thence along theouter surface'of'the body toward the closed end 12 of the body until, itfinally passes beyond flange 5. A small opening 13 in shell 1 and asmall notch or cut-out portion 13' in flange 5 act as guiding channelsfor the gas as it leaves the groove 11. I

In the closed end. 12 of body 1 is provided a square hole for receivingthe contact member 14 which contact member is shown in detail in Fiure'4. This contact member is formed wit a contact 15 riveted orotherwise rigidly secured to a springclasp or gripping member 16. Thisclasp is bent so as to roduce facing hooks 17 and 18. These hoo s areformed of resilient material and are positioned normally so that theends will be slightly spaced apart. However, when the clasp 16 is forcedinto position, as shown in Figure 2, the hooks 17 and 18 will be forcedtogether and will consequently firmly grip the fuse 20 positionedtherebetween near the hook end 19. It is, of course, understood that thefuse may be of any size, capacity or shape without departing from theinvention.

In operation, to assemble the plug the fuse 20 is bent for producing.the hook 19 after which it is slip ed into position 'as shown in Figure4. The contact member with the fuse is then forced in the square openingin closed end 12 of body 1 until it reaches the position shown in igure2. The free end of-the fuse is then bent over the edge of the body 1until it overlaps one or more of the threads 3, the fuse extendingthrough a suitable notch 21 in body 1. After the fuse has been thusproperly ositioned the shell 4- is screwed down over t e body 1 untilthe open end of the body is pressing the mica window 8 tightly againstthe shoulder 9 of the cap 6. The plug is then ready for use and may bescrewed in a socket in the usual manner whenever desired. During theordinary use of the plug air freely passes through the openin 13,cut-out portion 13', groove 11 and oles 10 into chamber 2. However, whenthere is a sufiicient overload placed on the line the fuse 20 will burnor blow and the gases will pass out in a reverse direction to thepassage of the air into chamber 2. ,After the fuse has burned out anditis desired to renew the same, the body 1 is unscrewed and the partscleaned. By a slight pressureon' the clasp 16 from within chamber 2 theentire contactmember 14 will become removed whereupon a new fuse may beplaced in position and the parts re-assembled. The operation of takingthe plug out, placing the fuse in position and the re-assembling of theparts requires no tools as this operation may be done better and moreexpeditiously by the handsfof the operator.

What we claim is: v

1. In a fuse plug of the character described, a hollow body having airand gas openings adjacent one end'merging into a groove, a shell havingan opening registeringwith said air and gas openings, a cap for theshell having a notch registering with the opening in said shell, saidnotch extending to a point exteriorly of the plug. a contact membercarried by said body, and a fus'ein said hollow body engaging saidcontact member and said shell.

2. In a fuse plug of thecharacter described, a body having a closed endformed with a square aperture merging into a chamber, and a threadedexterior, a removable contact member formed with resilient, slightlydiverging fuse receiving hooks, said. hooks being of such a size and sopositioned as to be pressed together when forced into said squareaperture for gripping a fuse having one end extending between saidhooks, a fuse member having one end grasped by said hooks and theopposite end overlapping some of the threads on said body, said. fusemember extending through 3. In a fuse plug inseam said chamber, a shellscrewed over said body on said threads, and an insulating cap carried bysaid shell, said cap covering one end of. said body. i

of the character described, a body formed with a closed end andan openend, a pair of spring gripping contact members arranged in said closedend, a cap carried by said open end, a fuse formed with a hook at eachend, one of said hook ends being engaged by one of said con tacts andthe hook thereof acting to prevent accidental displacement by pulling,the oppositeendvofsaid fuse having the hook part overlap said body and ametallic sleeve threaded onto said body, and frictionally engaging saidlast-mentioned hook end whereby the fuse is locked at both ends againstaccidental displacement.

4. In a fuse plug of the character de- -scribed,a bodyhaving a closedend and an open end, said open end having a radially extending aperturetherein and also an exteriorly positioned groove merging into saidaperture, said groove extending partly around the body, a metallicsleeve carried by said body exteriorly thereof, a contact member carriedby said closed end, a fuse connecting said contact member with saidsleeve, said sleeve having an opening therein adapted to register withsaid groove and a cap fitted onto said body at the open end formed witha. groove registering with the groove in the sleeve, said groove andsaid cap extending toward the closed end of the plug so as to dischargethe gas in a direction away from the open end of the body.

WILLIAM F; HEINS. JOHN HEINS.

iii

